I am currently trying to compare FE predictions to experimental results for a biaxial tension experiment using fiber reinforced tissue. Experimentally, it is common to report stress using 1st Piola-Kirchhoff stress, whereas FE results are based on Cauchy Stress. It is relatively easy to convert between the two knowing the Jacobian and the defomation gradient tensor. It seems PostView outputs the Jacobian under the Volume Ratio data field, but I am not aware of a way to access the deformation gradient tensor either directly through an output to the logfile from FEBio or through PostView. Is this currently possible in any way? If not, I will post a feature request.
I know that nodal displacements and position coordinates can be output to a logfile from FEBio and this can be used to calculate the deformation gradient through a script in Matlab, but I think that since FEBio specializes in biomechanics and many laboratories corroborate experimental and FE results, it would be great complement to the existing system to be able to directly access these measures in PostView or through a logfile.
Thanks!
Nathan
I know that nodal displacements and position coordinates can be output to a logfile from FEBio and this can be used to calculate the deformation gradient through a script in Matlab, but I think that since FEBio specializes in biomechanics and many laboratories corroborate experimental and FE results, it would be great complement to the existing system to be able to directly access these measures in PostView or through a logfile.
Thanks!
Nathan
Comment